The colour blue is associated with many things: virginity or purity in general, masculinity (and oddly enough, femininity as well), sadness, serenity, the sky, water, sadness, heroism, and on the Internet, hyperlinks. Another thing it's associated with is cold temperatures, and this is what this trope is about.

If a water tap has blue on it, it's pretty much guaranteed to produce cold water unless there is a flaw in it somehow. Anybody who feels cold (provided they're not having fever-chills) will immediately become blue in the face (and in wackier cartoons, blue in the everything, which may or may not include hair). Thermometers, especially in cartoons, might show temperatures below a certain point (e.g. ten, zero, etc) with a blue line (not usually true in real life— with real thermometers that have a line, it's usually red no matter what the temperature). Ice and occasionally snow might be shown with a bluish tint, and anything representing ice will be light blue. Even if the ice itself is not blue, if something or somebody is contained within it, they will have a blue tint. Characters whose jobs/powers/etc have to do with ice, cold, or winter (for example, An Ice Person, the ice part of a Fire/Ice Duo, etc) will tend to be blue or have blue clothes. Often, if a flame is blue, it will be cold, even though in real life, blue flames are hotter than normal ones.

Some Truth in Television to this: ice may look slightly blue depending on the lighting, and due to the altered blood flow that being cold often brings on, people might look a bit blue (especially in the face and/or extremities), though not to the extent that's found in cartoons. While thermometers might not work the way they do in fiction, water taps will often actually be painted blue if they produce cold water.

Please note that saying, "Played straight for X, averted for Y" is probably not necessary because blue is such a common colour that it's common for one blue thing to represent cold and another to not. However, "played straight for X, downplayed/zigzagged/etc for Y" may be useful. Use your best judgment. Interesting fact: blue is sometimes classified as a "cold colour" by artists. Due to the trope Ice Magic Is Water, this is related to the Water is Blue trope linked to above. Do note, however, that water will generally be shown as blue in illustrations and cartoons even if it's not cold. Contrast Fire Is Red.

The original series frequently uses blue as a secondary color for characters associated with the ice element. This is seen with Matoro, Kopeke (in his original design), Thok, Kazi, Strakk, Metus, and Gelu. Additionally, most ice-themed characters on Mata Nui and Metru Nui have Icy Blue Eyes, such as Kopaka, Nuju, Kohrak, Ehrye, and Keerakh.

The 2015 reboot once again uses blue as a secondary color for ice-themed characters, such as Kopaka, Izotor, and Melum. These characters also have Icy Blue Eyes.

In Warframe, Frost has the power to create avalanches and freeze people. His armor is blue and white.

In World of Warcraft, the torches and braziers in Ice Crown City burn with blue flames. In the fight with the first boss Lord Marrowgar, he throws these flames and calls them Coldflame; they deal frost damage to anyone who stands in them.

Taelia is a faerie who lives on the top of the icy Terror Mountain, sometimes referred to as the Snow Faerie, and she has blue feathers at the tips of her wings and wears a blue parka and blue lipstick.

In DC Comics:
The Flash villain Captain Cold wears a blue and white costume.
The New 52 version of Killer Frost not only wears blue, but also has blue skin.
Similarly, Icemaiden/ Sigrid Nansen also has blue skin and wears blue (with some white).
Her successor Ice/ Tora Olafsdotter also wears blue and white (although her skin is caucasian).

Hades in Disney's Hercules is usually portrayed as having blue skin and hair flames; when he gets angry, his head and the flames forming his hair turn red (which actually means he's getting colder...).

The original series frequently uses blue as a secondary color for characters associated with the ice element. This is seen with Matoro, Kopeke (in his original design), Thok, Kazi, Strakk, Metus, and Gelu. Additionally, most ice-themed characters on Mata Nui and Metru Nui have Icy Blue Eyes, such as Kopaka, Nuju, Kohrak, Ehrye, and Keerakh.

The 2015 reboot once again uses blue as a secondary color for ice-themed characters, such as Kopaka, Izotor, and Melum.

One-off Superman villain Cythonna is the Kryptonian goddess of ice, opposing the sun god Rao. Her skin and outfit are pale blue and she can produce ice at will on top of creating monsters from rime and frost.

Video Game

In Warframe, Frost's armor is entirely snow white and deep blue. He also has the ability to flash freeze others with a touch and can summon avalanches at will.

IDK, I wasn't really trying to make a point. And I thought the other meanings thing would make the intro more interesting. Also, please explain why if you're going to throw a bomb. Also, the draft is called Blue Means Cold, not "Is".

Ilke from Phenomena Has icy blue skin (and in some artwork) light blue hair because the frost spirit Hish blew some of his powers into her, making her become a frost child with power over everything cold.

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